They were turned aside, &c.— This is explained by Psalms 78:9 where the same word is used. The bow means a body of bowmen, who in the crisis of battle, like the Ephraimites above, either turn their bows against you, or run away. Mudge.
Related Commentaries of Psalms 78:57
Psalms 78:57
57 But turned back, and dealt unfaithfully like their fathers: they were turned aside like a deceitful bow.